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Soybean Diseases

August 4, 2000

Fungi: The disease situation is heating up in the soybean crop. Many of you have reported that sudden death syndrome (SDS) is becoming quite prevalent. The disease is very evident here in east-central Illinois, as covered in Loretta Ortiz-Ribbing's article this week.

Jim Morrison, Extension crops educator, Rockford Extension Center, reports white mold in irrigated soybeans at R3 in 30-inch rows. Irrigation provides a perfect environment for the development of this fungus. We have had enough rain and moderate temperatures this season though that it should be a concern particularly in the northern part of the state, whether the field is irrigated or not. Bruce Paulsrud covered the particulars of white mold in issue no. 17 of the Bulletin this year.

Viruses: Kevin Black also reported the beginning of virus symptoms in soybean, noting that the crinkled leaf symptoms are showing up on the newest leaves. With bean leaf beetle (BLB) populations high, certainly bean pod mottle virus (BPMV) is a possibility because the BLB can vector the disease. I discussed some of the knowns and unknowns about BPMV in issue no. 8 of the Bulletin this season.

Most of our virus diseases in Illinois though look very similar in the field. The only way to know for sure is to have them tested. I recommend Agdia, Inc., 30380 County Road 6, Elkhart, IN 46514; phone (219)264-2014 or 800-62-AGDIA, fax (219)264-2153; e-mail: or URL RLINK Director of the University of Illinois Plant Clinic, Nancy Pataky, reports that the clinic no longer gets a discount for you on Agdia samples; however, they certainly can be of aid to you in determining what viruses you should test for if you submit a sample.--Suzanne Bissonnette

Author: Suzanne Bissonnette

The Pest Management and Crop Development Bulletin
Executive Editor: Kevin Steffey, Extension Entomologist

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